package demo1;

public class Test {
    public static void drawMap(Shape shape){
        shape.draw();
    }
    public static void main(String[] args) {
        drawMap(new Cycle());
        drawMap(new Rect());
    }
}

class Shape{
    public void draw(){
        System.out.println("图形!");
    }
}

class Cycle extends Shape{
    @Override
    public void draw() {
        System.out.println("⭕");
    }
}

class Rect extends Shape{
    @Override
    public void draw() {
        System.out.println("矩形");
    }
}